Overriding method in category

[olejnjak]

Overriding method in category is not a good idea. Right now I came to issue, that I added new version of my Core data model to the project. And since then I can't run the app as Core data throw an exception ('NSInternalInconsistencyException', reason: 'Can't modify an immutable model.').

Reason is that when initializing Core data stack using Magical Record, it instantiates immutable model which is completely legit and then copies some NSEntityDescriptions. Which causes initialization to fail because it is an NSObject and uses copyWithZone:. That calls implementation from NSObject+RMCopyable and that crashes because it uses setValue:forKey: which can't be used as model is immutable.